Flyer e-bike error codes: causes and solutions
Flyer electric bikes have been renowned for years for their impressive reliability, powerful assistance, and high-quality construction. However, an e-bike is still an advanced piece of technology and, like any electronic device, malfunctions can occur.
Fortunately, the system is designed to communicate with you via an error code displayed on the screen. This handy signal indicates precisely whether the problem concerns, for example, the battery, motor, or sensors of the bike.
For many cyclists, however, the sudden appearance of an error message can be confusing, and it is not always clear what the best next step is. In this article, we review the most important and common error codes for Flyer e-bikes. We explain their causes, offer concrete solutions, and provide a clear summary table with all the codes at the end of the article.
Written by: Hanna Stevens | March 4, 2026 | Reading time: 6 minutes
More about the author: Hanna Stevens
Hanna is an avid cyclist who loves exploring new routes and sharing her experiences to inspire others to get on their bikes more often.
Key findings
- Code E3 does not usually indicate a faulty battery, but rather a software problem.
- Overheating on FIT systems is a protective measure, not immediate damage.
- Many error codes can be resolved by simply restarting the device or performing a visual check.
The most feared malfunction: code E3
If there is one error code that Flyer e-bike owners (especially those with the 36-volt Next Generation battery) see regularly, it is E3. This error often appears suddenly and mainly indicates a communication problem between the battery and the bike's display.
You can recognize this problem by the "E3" display on the screen or a flashing red light on the charger. The consequences are usually immediate: reduced motor performance or even a total loss of electric assistance.
The cause
The first reaction is often to think that the battery is completely out of service and needs to be replaced. Fortunately, in most cases, this is not the case. Although a damaged or pinched cable may be the cause, error E3 is most often related to the Battery Management System (BMS) software located on the battery's electronic board.
The solution
Start by checking the wiring yourself. If that doesn't solve the problem, don't rush out to buy a new battery: repair is usually cheaper and more sustainable.
Specialized repairers such as AccuCompany, Bikebat, or Fiets-accureparatie.be have extensive experience in resolving error E3. They repair and reset the BMS software, restoring factory settings and ensuring proper charging.
As an additional service, some technicians install a discreet reset button under a sticker on the battery. If error E3 reappears in the future, simply press the center of the sticker with a small pointed object to reset the code yourself.
Other important error codes (Next Generation)
In addition to code E3, here are some other important messages to be aware of on Next Generation models:
E1 (Connection error)
- Often a user error: the sensors do not respond because pressure was applied to the pedals at the moment of start-up.
- Solution: Turn off the screen, remove your feet from the pedals, and restart without applying pressure.
E2 (Connection error)
- The display is not receiving the signal from the speed sensor, which is usually incorrectly positioned near the wheel.
- Solution: Slightly reposition the magnet or speed sensor.
E5 (Authentication error)
- Problem communicating with the screen.
- Solution: Verify that you are using the original screen, check the cables to the motor, and thoroughly clean the contacts on the screen mount.
E9 (Engine fault)
- Serious engine failure.
- Solution: Try restarting the bike. If the problem persists, consult a technician.
FIT 1.0 and FIT 2.0 system error codes
For users of the RIDE 60 system, the LED Hub may display a warning.
Cause: This is a technical incident requiring the cyclist's attention.
Solution: A warning does not necessarily prevent the engine from operating and can often be resolved by the user themselves.
Error messages on the LED Hub
Newer Flyer models use the advanced FIT (Flyer Intelligent Technology) system. FIT 1.0 and FIT 2.0 displays show errors as double-digit numbers or hexadecimal codes.
A common theme in these models is thermal protection:
- 0A-0E: Overheating of the central computer (ECU).
- 66-34 / 66-35: battery too hot.
- 6A-xx: motor overheating, protection mode activated.
Solution in all cases: place the bike in the shade and allow the system to cool down completely before restarting.
Other examples:
- 05-08: Brake error when starting → Check that the brake levers are not stuck or dirty.
- 35-1B: Button cell battery (RTC battery) empty in the display → Replace the internal battery.
Summary table of Flyer error codes
| Error code | System | Problem / Cause | Solution |
|---|---|---|---|
| E1 | Next Generation | Pressure on the pedals when starting | Restart without pressing the pedals |
| E2 | Next Generation | Speed sensor missing or misaligned | Reposition the sensor |
| E3 | Next Generation | Communication/BMS software issue | Check cables, have battery repaired or reset |
| E5 | Next Generation | Screen authentication error | Clean contacts, check cables |
| E9 | Next Generation | Engine fault | Restart, or consult a specialist |
| 00:00 | FIT 1.0 | Unknown error | Contact the dealer |
| 01-01 to 01-2D | FIT 1.0 | ECU error | Restart, or contact your dealer |
| 05-08 | FIT 1.0 | Brake error when starting | Check brake levers |
| 0A-0E | FIT 1.0 | ECU overheating | Let cool |
| 35-1B | FIT 1.0 | RTC battery empty | Replace the button battery |
| 66-34 / 66-35 | FIT 1.0 | Battery overheating | Allow to cool, then restart. |
| 6A-xx | FIT 1.0 | Engine overheating | Let cool |
| 6B-39 / 6B-5A | FIT 1.0 | Faulty speed sensor | Check magnet and wiring |
| 2D-01 / 29-01 | FIT 2.0 | Screen identification error | Clean contacts |
| 2C-02 | FIT 2.0 | Internal screen error | Check contacts or test another screen |
| 18-01 / 0B-01 | FIT 2.0 | Engine error at startup | Check connections and restart |
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FAQ
What does E3 mean on a Flyer electric bike?
E3 usually indicates a communication problem between the battery and the display, often related to the BMS software.
Is my battery defective if I get an E3 error?
In most cases, no. A soft reset is sufficient.
What to do in case of engine code 6A?
First, allow the engine to cool down. If the problem persists, consult a dealer.
Why does code E1 appear at startup?
Because pressure was applied to the pedals during start-up.
Can I reset Flyer error codes myself?
Some do (by restarting). Others require professional intervention.